Gabby Petito’s parents have won a court ruling to gain access to a letter that Brian Laundrie’s mother offered him a shovel and garbage bags if he needed to dispose of a body, according to a letter enclosed in an envelope that said “burn after reading,” court filings reveal.

The letter was released to Gabby Petito’s parents Wednesday after a Florida judge denied a request from Laundrie’s parents to withhold it. The two families go to a civil trial next year.

Petito’s body was found on Sept. 19, 2021, in Wyoming, and the cause of her death was later ruled a homicide as she died by “manual strangulation“ at least three weeks earlier, a coroner said.

Laundrie’s body was found in a nature preserve near his parents home on Oct. 20, 2021. FBI said he left behind notes“claiming responsibility” for Petito’s death. A medical examiner ruled that Laundrie died from a self-inflicted gunshot wound.